Phosphoric acid anodizing per BAC and ASTM D Q. I am looking for technical information on PAA (phosphoric acid anodizing). 29 Dec D – Designation: D – 98 AMERICAN SOCIETY FOR TESTING PA Reprinted from the Annual Book of ASTM Standards. 1 Jun ASTM D Standard Recommended Practice for Preparation of Metal. Surfaces for Adhesive Bonding. ASTM D Standard Guide for.
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Historical Version s – view previous versions of standard. PAA and Chromic acid anodizing are thin coatings which I wouldn’t expect to have nearly the bad effect on fatigue strength that much thicker coatings like sulfuric anodizing have, yet they are somewhat porous and adhere to the substrate well, while being corrosion resistant.
This standard is also available to be included in Standards Subscriptions. Surely, since the original document was written, there have been advances in structural adhesive bonding. The only other anodize treatment called out for bonding prep work is CAA which now brings Hex Chrome into your facility.
Specifically, little protruding oxide fingers rise right up out of the aluminum – I’m not sure that a smooth surface or a rough surface would have any difference – a clean and properly deoxidized surface will behave identically given the same electrolyte, current density, etc. If you are interested, one I might suggest is Surface Prep.
Anodize at ASF for minutes. Start pulling them apart by hand careful of sharp edgesthen put a drop of water on the joint.
March 16, A. My main question is what is the recommended cathode material for awtm chemistry? We appended your question to a thread which should answer d3393 of your questions without having to wait for replies. Nonetheless, if the PAA is being called out for a pretreatment for a subsequent pressure bonding operation than the answer is no, sulphuric acid anodizing is not the coating of choice for a variety of reasons.
Parts must be transferred to the clean room within two hours of removal from the PAA line and be primed within 72 hours. We would like to know if it is it normal for the solution to turn a yellow color after processing. It is used as a surface preparation for bonding. This discussion is limited to single-lap specimens and shear strength only for simplification. Is there any literature about the advantages and problems associated with switching from phosphoric acid to sulfuric acid anodizing?
PAA is used to prepare the aluminum wstm for acceptance of the primer before bonding. Wstm Handwerker – Bensalem, Pennsylvania. It’s not possible to diagnose a asgm problem or the hazards of an operation via these pages. My company has a small phosphoric acid anodize set-up for prepping Al and Al. You MAY be surprised by the result. I am trying to set asstm a small bench top operation.
Many factors, however, apply to shear modulus, asrm strength, and tensile modulus measured by small laboratory specimens in general.
Phosphoric Acid Anodizing (PAA Process, primarily for adhesive bonding of aluminum)
If you have further questions, please feel free to follow up. If you see an affordable copy anywhere these days, grab it: My understanding is that some of Boeing’s competition does not use this process for adhesive bonding, but rather a variant of chromic acid anodizing. There is very little information on this specialized process.
When we wrote it some years ago, it contained just about everything we wanted for aerospace structural adhesive bonding. Minford from Abe Books or info on Amazon A. I was hoping someone could suggest a filtration technique for the acid tanks to keep chloride and fluoride levels down to acceptable levels 35 ppm for chloride, 75 ppm for fluoride.
Phosphoric acid anodizing per BAC5555 and ASTM D3933-98
Subscription pricing is determined by: The next best process to PAA would be any method of etching the aluminum surface to roughen the profile. It is not intended for the selection of materials.
Can anyone tell me what equipment is needed to phosphoric anodize aluminum? The spec can be obtained asgm Boeing commercial division or from some specification clearing houses like aerospheres.
Thanks you for your input regarding the suitability of sulphuric acid anodizing as a substitute for PAA. Prior to engineering your line you may wish to also think about production flow logistics as Ray mentioned which are critical for best results, as well as meeting most aerospace specs. I have just quoted a large phosphoric anodize job.
Standard Guides for Automotive and Aerospace Adhesives from ASTM
We could more easily recycle the waste anodizing solution is we could convert the phosphoric acid anodizing bath to sulfuric. They state that at this low roughness the plating has problems adhering.
You might find the article “An V3933 to Anodization: What is the temp of those tanks? Do you know where I can get the info?
Another would be Handbook of Adhesives edited by Skeist. The phosphoric acid anodized sheets are then pressure bonded. I am working on a project to find alternatives to Phosphoric Acid Anodizing to actually try to eliminate the phosphoric acid. That is a xstm decision. I don’t think this is possible, but I thought I should at least try to post the question.